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https://issues.apache.org/jira/browse/MAPREDUCE-4252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444326#comment-13444326
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Siddharth Seth commented on MAPREDUCE-4252:
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Chackaravarthy, that does seem like a valid case - either in case of reduce
speculation or a race between a reduce completing and a node being marked as
unhealthy. The 'successful attempt' check already exists in
MapRetroactiveKilledTransition. However, the REDUCE check will fail before
this. Could you please open a separate jira.
>From a quick look, ignoring the event for Reduce tasks should be sufficient.
> MR2 job never completes with 1 pending task
> -------------------------------------------
>
> Key: MAPREDUCE-4252
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4252
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.1
> Reporter: Tom White
> Assignee: Tom White
> Fix For: 0.23.3, 2.1.0-alpha, 3.0.0
>
> Attachments: MAPREDUCE-4252.patch, MAPREDUCE-4252.patch,
> MAPREDUCE-4252.patch, MAPREDUCE-4252.patch, MapReduce.png
>
>
> This was found by ATM:
> bq. I ran a teragen with 1000 map tasks. Many task attempts failed, but after
> 999 of the tasks had completed, the job is now sitting forever with 1 task
> "pending".
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